JP4842731B2 - Embedded magnet type rotating electric machine - Google Patents

Description

  The present invention relates to an interior magnet type rotating electrical machine.

  2. Description of the Related Art Conventionally, an embedded magnet type rotating electrical machine (motor) includes a rotor in which a plurality of housing holes that extend in the axial direction and extend in the radial direction are formed in a circumferential direction in a rotor core, and a magnet is disposed in each housing hole. There is something.

As such an embedded magnet type rotating electrical machine, there is one in which a circumferentially extending portion extending outward in the circumferential direction from the circumferential end of the magnet is formed at the radially outer end of the accommodation hole ( For example, see Patent Document 1). In such an embedded magnet type rotating electrical machine, since the circumferentially extending portion is formed and the magnetic resistance is increased at that portion, the leakage magnetic flux from the N pole of the magnet to the S pole immediately is reduced. .
JP 2004-173491 A

  However, in the above-described embedded magnet type rotating electrical machine (see Patent Document 1), since the rotor core and the entire surface of the radial end of the magnet are in contact with each other, the magnetic resistance is still low and the leakage flux can be reduced. There was a problem. This causes a reduction in the effective magnetic flux (relative to the stator) in the rotor of the embedded magnet type rotating electrical machine, which causes a reduction in motor efficiency.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an embedded magnet type rotating electrical machine capable of reducing leakage magnetic flux.

According to the first aspect of the present invention, the embedding includes a rotor core having a plurality of receiving holes extending in the circumferential direction and penetrating in the axial direction, and having a magnet disposed in the receiving hole. In the magnet-type rotating electrical machine, at least one of a radially outer end portion and a radially inner end portion in the accommodation hole is provided around the rotor core from a position corresponding to the circumferential end portion of the magnet. It is formed in the circumferential direction extension portion extending outwardly in the rotor core, at positions corresponding to the circumferential center of the said housing hole, in the radial direction of the magnet in the circumferential width smaller than the circumferential width of the magnets A radial restriction portion is formed to extend in the radial direction so as to abut to restrict the movement of the magnet in the radial direction, and the rotor core is formed of a core sheet in which pre-stacking accommodation holes that are stacked to become the accommodation holes are formed. A plurality of layers stacked in the axial direction A is the core sheet comprises a thin regulatory core sheet the radial direction regulating portion thinner than other portions is formed.

  According to this configuration, at least one of the radially outer end and the radially inner end of the accommodation hole is formed with a circumferentially extending portion that extends outward in the circumferential direction from the circumferential end of the magnet. As a result, the magnetic resistance increases at that portion, so that the leakage magnetic flux from the N pole of the magnet to the S pole of the magnet is reduced.

  In addition, at a position corresponding to the circumferential center of the receiving hole in the rotor core, the magnet extends in the radial direction so as to abut on the radial direction of the magnet with a circumferential width smaller than the circumferential width of the magnet, thereby moving the magnet in the radial direction. A restricting radial direction restricting portion is formed, and the magnetic resistance is further increased as compared with the one that abuts in the radial direction of the magnet over the entire circumferential width of the magnet, so that the leakage flux is further reduced.

  Further, the radial restriction portion has a smaller cross-sectional area as viewed from the radial direction than that formed in the entire axial direction of the rotor core, and the magnetic resistance is further increased as compared to that formed in the entire axial direction of the rotor core. Therefore, the leakage magnetic flux is further reduced. As a result, the effective magnetic flux in the rotor of the interior magnet type rotating electrical machine is increased, and the motor efficiency can be increased.

Further , the rotor core is formed by laminating the core sheet including the thin regulating core sheet in which the radial regulating part thinner than the other part is formed in the axial direction. Therefore, the above configuration can be easily obtained.

In the invention described in claim 2, in embedded magnet type rotary electric machine according to claim 1, wherein the radial restriction portion extends largely radially than the radial width of the circumferential direction extension portion.

According to this configuration, since the radial restricting portion extends in the radial direction larger than the radial width of the circumferentially extending portion, the leakage magnetic flux is further reduced .

According to a third aspect of the present invention, in the embedded magnet type rotating electric machine according to the first or second aspect , at least one of the radial direction regulating portions has a circumferential width of a distal end portion contacting the magnet. It was made smaller than the circumferential direction width | variety of the base end side of the radial direction control part which has a part .

  According to this configuration, at least one of the radial direction restricting portions is configured such that the circumferential width of the distal end contacting the magnet is made smaller than the circumferential width on the proximal end side, thereby suppressing a decrease in overall rigidity. That is, while suppressing the deformation of the radial restricting portion, the magnetic resistance is further increased, that is, the leakage flux is further reduced, compared with the case where the circumferential width of the distal end portion is the same as the circumferential width of the proximal end side. Can be achieved.

According to a fourth aspect of the present invention, in the embedded magnet type rotating electric machine according to any one of the first to third aspects, the radial direction restriction portion includes a radial outer end portion and a radial inner side in the accommodation hole. The circumferential width of the tip that is formed on both ends and contacts the magnet at the radially outer end is larger than the circumferential width of the tip that contacts the magnet at the radially inner end.

  According to this configuration, since the circumferential width of the distal end portion at the radially outer end portion is larger than the circumferential width of the distal end portion at the radially inner end portion, for example, when the rotor rotates, While increasing the rigidity of the radially restricting portion on the radially outer side that receives the centrifugal force of the magnet, the magnetic resistance can be further increased on the radially inner side, that is, the leakage flux can be further reduced.

According to a fifth aspect of the present invention, in the interior permanent magnet type rotating electric machine according to the third or fourth aspect , at least one of the radial direction restricting portions has a curved shape as viewed from an axial direction at a front end side in contact with the magnet. It was said.

According to this configuration, at least one of the radial direction restricting portions has a curved shape when viewed from the axial direction on the tip side that contacts the magnet. It is possible to make contact (line contact in the axial direction), and the configuration according to claim 3 can be easily obtained.

According to a sixth aspect of the present invention, in the embedded magnet type rotating electric machine according to the fifth aspect of the present invention, at least one of the radial direction restricting portions is in point contact with the magnet at a plurality of points when viewed from the axial direction. The tip side in contact with the magnet has a curved shape when viewed from the axial direction.

  According to this configuration, at least one of the radial direction restricting portions has a curved shape when viewed from the axial direction so that the tip side that contacts the magnet is point-contacted at a plurality of points when viewed from the axial direction. Therefore, the magnet can be stably supported while further reducing the leakage magnetic flux.

According to a seventh aspect of the present invention, in the embedded magnet type rotating electric machine according to any one of the first to sixth aspects, the rotor core is alternately formed with the receiving holes in a circumferential direction of the rotor core. And a fastening hole penetrating in the axial direction of the rotor core is formed, and the fastening hole is a fastening member that fastens each core sheet in the axial direction in a state where a plurality of the core sheets constituting the rotor core are laminated in the axial direction. a hole is inserted, the rotor core, said core sheets and stacked before fastening holes are laminated and stacked becomes the accommodating hole before lamination housing hole serving as the fastening holes are formed alternately in the circumferential direction central position but will be stacked in the axial direction, a shall such are fastened by the fastening member each core sheet is inserted into the fastening holes that are stacked, the fastening hole, as viewed in the axial direction But, Serial magnet is set to 52% or less of the positions from the radially inner side 27 percent or more in the radial extent being provided.

  According to the same configuration, the fastening hole is set at a position where the center position seen from the axial direction is 27% or more and 52% or less from the radially inner side in the radial range where the magnet is disposed. The flow becomes good, and the output can be set to a value almost close to the maximum (see FIG. 5, 99% or more).

According to an eighth aspect of the present invention, in the interior permanent magnet type electric rotating machine according to the seventh aspect , the fastening hole has a radial position in a radial range where the magnet is disposed at a center position viewed from the axial direction. The position was set at 36% or more and 41% or less from the inside.

  According to this configuration, the fastening hole is set at a position where the center position seen from the axial direction is not less than 36% and not more than 41% from the radially inner side in the radial range where the magnet is disposed. The flow becomes even better, and the output can be set to a substantially maximum value (see FIG. 5, almost 100%).

  ADVANTAGE OF THE INVENTION According to this invention, the embedded magnet type rotary electric machine which can reduce a leakage magnetic flux can be provided.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, an embedded magnet type motor as an embedded magnet type rotating electrical machine includes a stator 1 and a rotor 2.

  The stator 1 is formed in a substantially cylindrical shape as a whole, and has a plurality of teeth 4 formed so as to extend from the inner peripheral surface of the cylindrical portion 3 forming the outer shape toward the axial center at equal circumferential intervals. The stator core 5 is provided with a winding 6 (only part of which is shown by a two-dot chain line in FIG. 1) wound around each tooth 4 by concentrated winding via an insulator (not shown). In the present embodiment, twelve teeth 4 are formed.

The rotor 2 includes a rotating shaft 7, a rotor core 8 fixed to the rotating shaft 7, and a magnet 9 disposed in an accommodation hole 8 a formed in the rotor core 8.
More specifically, the rotor core 8 is formed in a substantially cylindrical shape in which the rotation shaft is press-fitted into the center hole. The rotor core 8 is formed with a plurality of (10 in the present embodiment) accommodation holes 8a extending in the axial direction and extending in the radial direction, and the magnets 9 are accommodated and held in the accommodation holes 8a. . The magnet 9 is formed in a substantially rectangular parallelepiped shape that is magnetized in the short direction (the circumferential direction in a state of being disposed in the accommodation hole 8a) when viewed from the axial direction. And the pole which opposes the circumferential direction by the magnets 9 adjacent to the circumferential direction is made the same, and one magnetic pole (S pole or N pole) is comprised by them.

  In addition, the radially outer end and the radially inner end of each accommodation hole 8a of the rotor core 8 are extended in the circumferential direction so that the circumferential width is wider than the circumferential end of the magnet 9 so as to extend outward in the circumferential direction. Portions 8b and 8c are formed.

  Further, at the position corresponding to the center in the circumferential direction of each receiving hole 8 a in the rotor core 8, the circumferential width of the magnet 9 is smaller than the circumferential width (width in the short direction), and the radially outer side and the inner side of the magnet 9 are respectively contacted. Radial direction restricting portions 8d and 8e are formed to extend inward and outward in the radial direction so as to come into contact with each other and restrict the movement of the magnet 9 in the radially outer side and the inner side, respectively. In the present embodiment, the radial protrusions of the radial restricting portions 8d and 8e are set to be the same as the radial widths of the circumferentially extending portions 8b and 8c.

  And the radial direction control parts 8d and 8e are formed so that the cross-sectional area seen from radial direction may become smaller than what was formed in the whole axial direction of the rotor core 8. FIG. Specifically, as shown in FIGS. 2 and 3, the rotor core 8 is formed by laminating a plurality of core sheets in the axial direction in which the pre-lamination receiving holes 11 a and 12 a that are stacked to become the receiving holes 8 a are formed. The core sheet includes a regulation core sheet 11 in which the radial direction regulation portions 8d and 8e are formed and a non-regulation core sheet 12 in which the radial direction regulation portions 8d and 8e are not formed. The rotor core 8 of the present embodiment is formed by alternately stacking the regulation core sheets 11 (see FIG. 2 (a)) and the non-regulation core sheets (see FIG. 2 (b)) one by one (see FIG. 2). 3). In FIG. 3, two sheets of the regulated core sheet 11 and the non-regulated core sheet 12 are illustrated, but each number is set by the axial length (size) of the embedded magnet type motor (rotor 2). Of course, three or more may be used.

  In addition, pre-lamination fastening holes 11 b and 12 b that are laminated and become fastening holes 10 are formed in each core sheet (the regulated core sheet 11 and the non-regulated core sheet 12) of the present embodiment. The pre-lamination fastening holes 11b and 12b are disposed between the circumferential directions (center) of the pre-lamination accommodation holes 11a and 12a adjacent to each other in the circumferential direction, in other words, in the circumferential direction (at equiangular intervals) with the pre-lamination accommodation holes 11a and 12a. ) Alternatingly formed. In the rotor core 8, core sheets (regulated core sheet 11 and non-regulated core sheet 12) are laminated, the magnets 9 are accommodated and held in the accommodation holes 8a, and disk plates P (see FIG. 4) are provided at both axial ends. ) Is disposed, and is fastened by a rivet R as a fastening member inserted through the fastening hole 10. The disk plate P is formed with the same holes as the pre-lamination fastening holes 11b and 12b (fastening holes 10), but the same holes as the pre-lamination housing holes 11a and 12a (housing holes 8a) are formed. In addition, the movement of the magnet 9 in the axial direction is restricted by the disk plate P (prevention of slipping). Further, in FIG. 4, illustration of the boundary between each core sheet (the regulated core sheet 11 and the non-regulated core sheet 12) is omitted, and the radial position of the magnet 9 accommodated and held therein is schematically illustrated. .

  Further, as shown in FIG. 1, the fastening hole 10 in the present embodiment has a center position X1 viewed from the axial direction at a position 40% from the radial inner side in the radial range H1 where the magnet 9 is disposed. Is set to In other words, the radial distance Y from the radial position at the radially inner end of the magnet 9 to the radial position of the center position X1 of the fastening hole 10 is the length of the radial range H1 where the magnet 9 is disposed ( 40% of the radial length of the magnet 9).

  Here, the said center position X1 of the fastening hole 10 is set based on the characteristic obtained from the experimental result (refer FIG. 5). That is, as shown in FIG. 5, the fastening hole 10 has a center position X1 as seen from the axial direction at a position that is 27% or more and 52% or less from the radial inside in the radial range H1 where the magnet 9 is disposed. When set, the flow of the magnetic flux becomes good, the torque T is almost maximum and the rotation speed N is almost the maximum value, and the output S is almost the maximum value (99% or more of the maximum value). . Further, when the center position X1 viewed from the axial direction is set at a position of 36% or more and 41% or less from the radially inner side in the radial range H1 where the magnet 9 is disposed, the fastening hole 10 The flow is further improved, the torque T is substantially maximum and the rotation speed N is substantially maximum, and the output S is substantially maximum (approximately 100%). Therefore, in the present embodiment, the center position X1 of the fastening hole 10 is a position satisfying a position of 36% or more and 41% or less from the radially inner side in the radial range H1 where the magnet 9 is disposed. The position is set. 5 shows the characteristics of the torque T and the rotational speed N as well as the output S, but the vertical scale (99% and 100%) in FIG. 5 is for the output S only.

Next, characteristic actions and effects of the first embodiment will be described below.
(1) A circumferentially extended circumferential width is formed at the radially outer end and radially inner end of each receiving hole 8a of the rotor core 8 so as to extend outward in the circumferential direction from the circumferential end of the magnet 9. Since the magnetic resistance is increased at the portions 8b and 8c formed, the leakage magnetic flux from the N pole of the magnet 9 toward the S pole of the magnet 9 is reduced.

  Further, at the position corresponding to the center in the circumferential direction of each receiving hole 8 a in the rotor core 8, the circumferential width of the magnet 9 is smaller than the circumferential width (width in the short direction), and the radially outer side and the inner side of the magnet 9 are respectively contacted. Radial direction restricting portions 8d and 8e are formed to extend inward and outward in the radial direction so as to be in contact with each other and restrict movement of the magnet 9 in the radially outer side and the inner side, respectively. Therefore, since the magnetic resistance is further increased as compared with the magnet 9 that is in contact with the entire radial width of the magnet 9 in the radial direction, the leakage magnetic flux is further reduced.

  Further, the radial restriction portions 8d and 8e are formed so that the cross-sectional area viewed from the radial direction is smaller than that formed in the entire axial direction of the rotor core 8, and are formed in the entire axial direction of the rotor core 8. Compared with the magnetic resistance, the magnetic flux leakage is further reduced. As a result, the effective magnetic flux (with respect to the stator 1) in the rotor 2 of the embedded magnet type motor is increased, and the motor efficiency can be increased.

  (2) The rotor core 8 includes a core sheet including a restriction core sheet 11 in which the radial direction restriction portions 8d and 8e are formed and a non-restriction core sheet 12 in which the radial direction restriction portions 8d and 8e are not formed. Therefore, it is possible to easily obtain the radial direction restricting portions 8d and 8e having a smaller cross-sectional area as viewed from the radial direction than that formed in the entire axial direction of the rotor core 8.

  (3) Since the rotor core 8 is formed by alternately laminating the regulation core sheet 11 and the non-regulation core sheet one by one, the radial direction regulation portions 8d and 8e are formed at equal intervals in the axial direction and the magnet 9 or the like. Abutted on the interval. Therefore, the movement of the magnet 9 in the radial direction can be regulated in a balanced manner (while preventing inclination and the like).

  (4) The center position X1 of the fastening hole 10 is set to a position of 40%, which is a position that satisfies a position of 36% or more and 41% or less from the radially inner side in the radial range H1 where the magnet 9 is disposed. Therefore, the flow of the magnetic flux is further improved, and the output S can be set to a substantially maximum value (see FIG. 5, almost 100%).

The first embodiment may be modified as follows.
In the first embodiment, the rotor core 8 is configured such that the regulation core sheet 11 and the non-regulation core sheet are alternately laminated one by one. However, the present invention is not limited to this, and the regulation core sheet 11 and the non-regulation core sheet A plurality of regulation core sheets may be alternately stacked. Further, the number of the regulation core sheet 11 and the non-regulation core sheet 12 may be different. For example, in the case of an embedded magnet type motor having a high-speed rotation specification, two regulation core sheets 11 and one non-regulation core sheet are used. The regulation core sheets 12 may be alternately laminated to strongly restrict the movement of the magnet in the radial direction (compared to the embodiment).

  In the first embodiment, the rotor core 8 is formed by laminating the regulation core sheet 11 and the non-regulation core sheet. However, the rotor core 8 is cut from the radial direction than that formed in the entire axial direction of the rotor core 8. If it becomes the structure which has a radial direction control part with a small area, you may comprise by laminating | stacking another core sheet.

  For example, you may change as shown in FIG.6 and FIG.7. That is, the rotor core 21 (see FIG. 7) is formed by laminating a core sheet including a thin regulating core sheet 22 (see FIG. 6) in which radial regulating parts 21a and 21b thinner than other parts are formed in the axial direction. The thin regulation core sheet 22 of this example has a shape in which the axial thickness of the radial regulation parts 8d and 8e in the regulation core sheet 11 of the above embodiment is only thinned. Further, the entire radial direction restricting portions 21 a and 21 b in this example are set to a thickness half that of the other portions of the thin restricting core sheet 22. The rotor core 21 is formed by laminating only the thin regulation core sheets 22 in a plurality of axial directions. Even in this case, the radial restricting portions 21a and 21b having a smaller cross-sectional area viewed from the radial direction than those formed in the entire axial direction of the rotor core 8 can be easily obtained. In addition, if the method of press-molding the radial direction restricting portions 21a and 21b in the thin thickness restricting core sheet 22 is adopted in the pressing process, the thin thickness restricting core sheet 22 is generated while generating compressive stress in the radial direction restricting portions 21a and 21b. Can be easily obtained.

  Moreover, in the said another example (refer FIG.6 and FIG.7), although the radial direction control part 21a, 21b whole was set to the half thickness of the other part of the thin control core sheet 22, it is limited to this. Alternatively, the shape may be changed to another shape as long as at least a part of the radial direction restricting portions 21 a and 21 b is thinner than the other portions of the thin restricting core sheet 22. For example, as schematically shown in FIG. 8A, the radial direction restricting portion 23 may be changed to become thinner toward the magnet 9 side in the radial direction. Further, for example, as schematically shown in FIG. 8B, the radial direction restricting portion 24 may be changed to be thicker (not thinner) toward the middle in the radial direction. Further, for example, as schematically shown in FIG. 8C, the radial direction restricting portion 25 may be changed to be thinner toward the middle in the radial direction. In FIG. 8, only one thin regulation core sheet 22 is illustrated.

  Further, for example, the core sheet may include an outer regulation core sheet in which the radial regulation part is formed only on the radially outer side and an inner regulation core sheet in which the radial regulation part is formed only on the radially inner side. That is, in the outer regulation core sheet of this example, for example, the radial regulation part 8d on the radially outer side of the regulation core sheet 11 of the above embodiment is formed, and the radial regulation part 8e on the radially inner side is not formed. Shape. Further, in the inner regulation core sheet of this example, for example, the radial regulation part 8e inside the radial direction of the regulation core sheet 11 of the above embodiment is formed, and the radial regulation part 8d outside in the radial direction is not formed. Shape. Even in this case, it is possible to easily obtain a radial direction restricting portion having a smaller sectional area when viewed from the radial direction than that formed in the entire axial direction of the rotor core 8. And, for example, the rotor core may be formed by alternately laminating the outer regulation core sheet and the inner regulation core sheet one by one or a plurality of sheets. Thus, the radial restricting portions are formed at equal intervals in the axial direction and are in contact with the magnets at equal intervals. Therefore, the movement of the magnet in the radial direction can be regulated in a well-balanced manner (while preventing inclination and the like).

  Further, for example, the core sheet has a circumferential direction in which the radial direction restriction portion is formed in at least one of the plurality of pre-stacking accommodation holes in the circumferential direction and the radial direction restriction portion is not formed in at least one of the core sheets. A partly regulated core sheet may be included, and the rotor core may be formed by laminating the core sheet so that the radial direction regulating part is disposed in a part of the axial direction of the accommodation hole. That is, the circumferentially partly regulated core sheet in this example is formed, for example, every other one of the pre-stacking accommodation holes 11a in which the radial direction regulating portions 8d and 8e of the regulated core sheet 11 of the above embodiment are arranged in the circumferential direction. Shape. Even in this case, it is possible to easily obtain a radial direction restricting portion having a smaller sectional area when viewed from the radial direction than that formed in the entire axial direction of the rotor core 8. And, for example, the rotor core may be formed by laminating the circumferentially-partially regulated core sheets one by one or plurally by shifting in the circumferential direction (for example, the space between the accommodation holes 11a before lamination). If it does in this way, a radial direction control part can be formed in the axial direction at equal intervals, and can be made to contact | abut with the said magnet at equal intervals. Therefore, the movement of the magnet in the radial direction can be regulated in a well-balanced manner (while preventing inclination and the like).

  Of course, the above core sheets (restricted core sheet 11, non-restricted core sheet 12, thin-restricted core sheet 22, outer restricted core sheet, inner restricted core sheet, and circumferentially partially restricted core sheet) are combined. A rotor core may be configured.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 9, an embedded magnet type motor as an embedded magnet type rotating electrical machine includes a stator 1 and a rotor 31. Since the stator 1 in the second embodiment is the same as the stator 1 in the first embodiment, the same reference numerals are given and detailed description thereof is omitted.

The rotor 31 includes a rotating shaft 32, a rotor core 33 that is fixed to the rotating shaft 32, and a magnet 34 that is disposed in an accommodation hole 33 a formed in the rotor core 33.
More specifically, the rotor core 33 is formed by laminating a plurality of core sheets in the axial direction, and is formed in a substantially cylindrical shape in which the rotary shaft 32 is press-fitted into the center hole. The rotor core 33 is formed with a plurality of (10 in the present embodiment) accommodation holes 33a extending in the axial direction and extending in the radial direction, and the magnets 34 are accommodated and held in the accommodation holes 33a. . The magnet 34 is formed in a substantially rectangular parallelepiped shape that is magnetized in the short direction (circumferential direction in the state of being disposed in the accommodation hole 33a) when viewed from the axial direction. And the pole which opposes the circumferential direction by the magnets 34 adjacent in the circumferential direction is made the same, and one magnetic pole (S pole or N pole) is comprised by them.

  In addition, the radially outer end and the radially inner end of each receiving hole 33a of the rotor core 33 are extended in the circumferential direction so that the circumferential width is wider than the circumferential end of the magnet 34 so as to extend outward in the circumferential direction. Portions 33b and 33c are formed.

  The rotor core 33 has a circumferential width smaller than the circumferential width (width in the short direction) of the magnet 34 at a position corresponding to the circumferential center on the radially outer side of each receiving hole 33a in the rotor core 33. A radial restricting portion 33d is formed which extends inward in the radial direction larger than the radial width of the circumferentially extending portion 33b so as to abut against it and restricts the movement of the magnet 34 outward in the radial direction. The rotor core 33 has a circumferential width smaller than the circumferential width (width in the short direction) of the magnet 34 at a position corresponding to the circumferential center on the radially inner side of each receiving hole 33 a in the rotor core 33. A radially restricting portion 33e is formed which extends radially outwardly to be in contact with the circumferentially extending portion 33c and restricts the movement of the magnet 34 radially inward. In the radial direction restricting portions 33d and 33e of the present embodiment, the circumferential widths of the distal end portions 33f and 33g contacting the magnet 34 are the same as the circumferential width on the base end side (that is, the circumferential width is in the radial direction). Along the line). Further, the radial direction restricting portion 33d on the radially outer side and the radial direction restricting portion 33e on the radially inner side have the same circumferential width at the tip portions 33f and 33g.

  In addition, each core sheet constituting the rotor core 33 of the present embodiment is also formed with a pre-stacking fastening hole that is laminated and becomes a fastening hole 35 as in the first embodiment. Also in the fastening hole 35 in the present embodiment, as in the first embodiment, the center position X2 viewed from the axial direction is the radially inner side in the radial range H2 in which the magnet 34 is disposed. Is set at a position of 40%.

Next, the characteristic operational effects of the second embodiment will be described below.
(1) A circumferentially extended circumferential width is formed at the radially outer end and radially inner end of each accommodation hole 33a of the rotor core 33 so as to extend outward in the circumferential direction from the circumferential end of the magnet 34. Since the magnetic resistance increases at the portions 33b and 33c formed, the leakage magnetic flux from the N pole of the magnet 34 to the S pole of the magnet 34 is reduced.

  In addition, at a position corresponding to the center in the circumferential direction of each accommodation hole 33a, it is necessary to abut on the radially outer side and the inner side of the magnet 34 with a circumferential width smaller than the circumferential width (width in the short direction) of the magnet 34. Radial direction restricting portions 33d and 33e are formed which extend inward and outward in the radial direction larger than the radial width of the circumferentially extending portions 33b and 33c and restrict the movement of the magnet 34 in the radially outward and inward directions, respectively. Therefore, since the magnetic resistance is further increased as compared with the magnet 34 that is in contact with the entire radial width of the magnet 34 in the radial direction, the leakage magnetic flux is further reduced. As a result, the effective magnetic flux (with respect to the stator 1) in the rotor 31 of the embedded magnet type motor increases, and the motor efficiency can be increased.

  (2) The center position X2 of the fastening hole 35 is set to a position of 40%, which is a position satisfying a position of 36% or more and 41% or less from the radially inner side in the radial range H2 where the magnet 34 is disposed. Therefore, the flow of magnetic flux is further improved, and the output can be set to a substantially maximum value (see FIG. 5, almost 100%).

The second embodiment may be modified as follows.
In the second embodiment, in each of the radial direction restricting portions 33d and 33e, the circumferential width of the distal end portions 33f and 33g in contact with the magnet 34 is the same as the circumferential width on the base end side (that is, the circumferential width is the same). However, the present invention is not limited to this, and the circumferential width may be changed depending on the position in the radial direction. For example, the circumferential width of the distal end that contacts the magnet in at least one of the radial restricting portions may be smaller than the circumferential width on the proximal end side. In this case, the circumferential width of the distal end portion is made the same as the circumferential width of the proximal end side while suppressing a decrease in the overall rigidity of the radial direction regulating portion, that is, suppressing deformation of the radial direction regulating portion. The magnetic resistance can be further increased, that is, the leakage magnetic flux can be further reduced as compared with the above.

  Specifically, for example, as shown in FIG. 10 (a), the distal end side that contacts the magnet 34 in each of the radial direction restricting portions 41 and 42 is a curved shape when viewed from the axial direction, and is a semicircular shape (R shape). ), The circumferential width of the distal end portions 41a and 42a may be smaller than the circumferential width on the proximal end side. In this example (see FIG. 10A), the radial direction regulating portions 41 and 42 (tip portions 41a and 42a) and the magnet 34 are in point contact (line contact in the axial direction). Further, for example, as shown in FIG. 10B, the radial direction restricting portions 41 and 42 (tip portions 41b and 42b) are in point contact with a plurality of points (two points in this example) (line in the axial direction). 2) (a pair) of substantially semicircular shapes (R shape) in the circumferential direction as viewed from the axial direction. It is good. In this way, the magnet 34 can be stably supported while further reducing the leakage flux by reducing the circumferential width of the distal end portions 41b and 42b in contact with the magnet 34 to be smaller than the circumferential width on the proximal end side. Can do. Of course, the radial direction regulating portion (tip portion) may be changed so as to make point contact with the magnet 34 at a plurality of three or more points.

  Further, for example, as shown in FIG. 11, the distal end side that contacts the magnet 34 in each radial direction restricting portion 43, 44 has a substantially trapezoidal shape in which the circumferential width decreases toward the distal end portions 43 a, 44 a. The circumferential width of the distal end portions 43a and 44a may be smaller than the circumferential width on the proximal end side.

  In addition, for example, as shown in FIG. 12, the circumferential width is increased toward the distal end portions 45a and 46a as a shape in which one of the circumferential directions on the distal end side contacting the magnet 34 is notched in each radial direction restricting portion 45 and 46. The circumferential width of the distal end portions 45a and 46a may be made smaller than the circumferential width on the base end side by making the trapezoidal shape smaller. In this example (see FIG. 12), the notched sides of the radially restricting portion 45 on the radially outer side and the radially restricting portion 46 on the radially inner side are the same (both clockwise in FIG. 12). .

  Further, for example, as shown in FIG. In this example, first, as in the other example (see FIG. 12), the radial direction restricting portions 47 and 48 are directed to the tip portions 47a and 48a as a shape in which one end in the circumferential direction on the tip side that contacts the magnet 34 is cut out. By adopting a substantially trapezoidal shape with a smaller circumferential width, the circumferential width of the tip portions 47a and 48a is made smaller than the circumferential width on the base end side. In this example (see FIG. 13), the circumferential width of the distal end portion 47a of the radial restricting portion 47 on the radially outer side is made larger than the circumferential width of the distal end portion 48a of the radial restricting portion 48 on the radially inner side. ing. In this way, for example, while increasing the rigidity of the radial restricting portion 47 on the radially outer side that receives the centrifugal force of the magnet 34 during rotation of the rotor, the magnetic resistance is further increased in the radially restricting portion 48 on the radially inner side. An increase, that is, a further reduction of leakage flux can be achieved. That is, in this way, it becomes easy to deal with a high-speed rotation embedded magnet type motor in which centrifugal force increases. In this example (see FIG. 13), the notched side (counterclockwise in FIG. 13) of the radially restricting portion 47 on the radially outer side and the notched side of the radially restricting portion 48 on the radially inner side (see FIG. 13). 13 in the clockwise direction). Further, in this example (see FIG. 13), the circumferential width of the distal end portions 47a, 48a is made smaller than the circumferential width of the base end side in each of the radially restricting portions 47, 48 on the radially outer side and radially inner side. The circumferential width of the distal end portion of the radially restricting portion only on the radially outer side may be the same as the circumferential width on the proximal end side (that is, the circumferential width is constant along the radial direction). Even in this case, the circumferential width of the distal end portion of the radially restricting portion on the radially outer side can be made larger than the circumferential width of the distal end portion 48a of the radially restricting portion 48 on the radially inner side. That is, as described above, for example, while the rigidity of the radial restricting portion is increased on the radially outer side that receives the centrifugal force of the magnet 34 during the rotation of the rotor, the magnetic resistance is further increased in the radially restricting portion 48 on the radially inner side. Increase, that is, the leakage flux can be further reduced.

  Note that the configuration in the second embodiment (see FIG. 9) and the configuration in another example (see FIGS. 10 to 13 and the like) may be combined with the configuration in the first embodiment. For example, the radial protrusions of the radial restricting portions 8d and 8e of the first embodiment may be set larger than the radial width (length) of the circumferentially extending portions 8b and 8c.

  In the first and second embodiments, the center positions X1 and X2 of the fastening holes 10 and 35 are positions 40% from the radially inner side in the radial ranges H1 and H2 where the magnets 9 and 34 are disposed. However, the present invention is not limited to this, and may be set to another position of 36% or more and 41% or less. Further, the center positions X1 and X2 of the fastening holes 10 and 35 are 27% or more and 52% or less (36% or more and 41% or less) from the radially inner side in the radial direction ranges H1 and H2 where the magnets 9 and 34 are disposed. It may be set to a position of Even if it does in this way, the flow of magnetic flux will become favorable and the output S can be made into the value (99% or more of the maximum value) near substantially maximum.

  In the first and second embodiments, the circumferentially extending portions 8b, 8c, 33b, 33c and the radial direction with respect to the radially outer end and the radially inner end of all the receiving holes 8a, 33a The restricting portions 8d, 8e, 33d, and 33e are formed. However, they may be formed for a part of the receiving holes, or only at the radially outer end portion or only at the radially inner end portion. May be.

  In the first and second embodiments, the rotor cores 8 and 33 are formed by stacking the core sheets in the axial direction. However, the present invention is not limited to this, and the rotor cores 8 and 33 are formed by other methods (for example, magnetic A sintered core obtained by sintering powder may be used.

-You may change the number of the teeth 4 of the said 1st and 2nd embodiment, the number of accommodation holes 8a and 33a, the magnets 9 and 34, etc. to another number.
The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.

(B) The method of producing a buried magnet type rotary electric machine, comprising the pressing step of press-forming said radially restricting portion in the thin regulating core sheet. In this way, since the radial restricting portion in the thin regulating core sheet is press-molded in the pressing step, it is possible to easily obtain the thin regulating core sheet while generating a compressive stress in the radial regulating portion. .

(B) at least one of the previous Ki径direction regulating portion, characterized in that as the circumferential width the magnet abutting the distal end side toward the distal end is a smaller substantially trapezoidal shape. According to this configuration, at least one of the radial direction restricting portions has a substantially trapezoidal shape in which the circumferential width decreases toward the tip portion that comes into contact with the magnet, and thus the circumferential width of the tip portion that comes into contact with the magnet. However, it is possible to easily obtain a radial restricting portion that is smaller than the circumferential width on the base end side of the radial restricting portion having the distal end portion .

The top view of the stator and rotor of an interior magnet type motor in a 1st embodiment. (A) The partial top view of the control core sheet in this Embodiment. (B) The partial top view of the non-regulation core sheet in this Embodiment. The exploded perspective view of the rotor core in this Embodiment. Sectional drawing of the rotor in this Embodiment. The center position of a fastening hole-an output characteristic view. The partial perspective view of the thin regulation core sheet in another example. The partial perspective view of the rotor core in another example. (A)-(c) The schematic cross section for demonstrating the radial direction control part in another example. The top view of the stator and rotor of an interior magnet type motor in a 2nd embodiment. (A) (b) The partial enlarged plan view of the rotor in another example. The partial enlarged plan view of the rotor in another example. The partial enlarged plan view of the rotor in another example. The partial enlarged plan view of the rotor in another example.

Explanation of symbols

  2, 31 ... rotor, 8, 21, 33 ... rotor core, 8a, 33a ... accommodation hole, 8b, 8c, 33b, 33c ... circumferentially extending portion, 8d, 8e, 21a, 21b, 23-25, 33d, 33e , 41 to 48 ... radial restriction part, 9, 34 ... magnet, 10, 35 ... fastening hole, 11 ... restriction core sheet, 11a, 12a ... pre-stacking accommodation hole, 11b, 12b ... pre-stacking fastening hole, 12 ... non Restriction core sheet, 22... Thin restriction core sheet, 41a to 48a, 41b, 42b... Tip, X1, X2... Center position, H1, H2.

Claims (8)

An embedded magnet type rotating electrical machine including a rotor core that has a rotor core that penetrates in the axial direction and extends in the circumferential direction and that has a plurality of radially extending receiving holes, the magnet being disposed in the receiving hole,
In the rotor core, at least one of a radially outer end and a radially inner end of the accommodation hole is extended in a circumferential direction extending outward in the circumferential direction from a position corresponding to the circumferential end of the magnet. Part is formed,
The rotor core has at its corresponding the circumferential center of the accommodation hole position, size of the magnet in the circumferential width smaller than a circumferential width extending radially so as to abut the radial direction of the magnet of the magnet A radial direction restricting portion that restricts movement in the direction is formed,
The rotor core is formed by laminating a plurality of core sheets in the axial direction in which pre-lamination accommodation holes that are laminated to serve as the accommodation holes are formed,
The core sheet includes an embedded magnet-type rotating electrical machine characterized in that the core sheet includes a thin regulation core sheet in which the radial regulation part is thinner than other parts . In the interior magnet type rotating electric machine according to claim 1 ,
The embedded magnet type rotating electrical machine, wherein the radial restricting portion extends in a radial direction larger than a radial width of the circumferentially extending portion. The interior permanent magnet type electric rotating machine according to claim 1 or 2 ,
At least one of the radial direction restricting portions has a buried width characterized in that a circumferential width of a distal end portion in contact with the magnet is smaller than a circumferential width of a proximal end side of the radial direction restricting portion having the distal end portion. Built-in magnet type rotating electric machine. In the interior magnet type rotating electric machine according to any one of claims 1 to 3 ,
The radial restricting portion is formed at both the radially outer end and the radially inner end of the receiving hole, and the circumferential width of the tip that contacts the magnet at the radially outer end is the radially inner end. An embedded magnet type rotating electrical machine characterized in that it is made larger than the circumferential width of the tip portion in contact with the magnet. In the interior magnet type rotating electric machine according to claim 3 or 4 ,
At least one of the radial direction restricting portions has a curved shape when viewed from the axial direction at the tip end side in contact with the magnet. In the interior magnet type rotating electric machine according to claim 5 ,
At least one of the radial direction restricting portions has a curved shape when viewed from the axial direction so that the front end side in contact with the magnet is point-contacted at a plurality of points when viewed from the axial direction. Embedded magnet type rotating electrical machine. The interior permanent magnet type rotating electrical machine according to any one of claims 1 to 6 ,
The rotor core is formed with fastening holes that are formed alternately with the receiving holes in the circumferential direction of the rotor core and penetrate in the axial direction of the rotor core, and the fastening holes are formed by the core sheet constituting the rotor core. It is a hole through which a fastening member for fastening each core sheet in the axial direction in a state where a plurality of layers are stacked in the direction,
The rotor core, said core sheets and stacked before fastening holes are laminated and stacked becomes the accommodating hole before lamination housing hole serving as the fastening holes are formed alternately in the circumferential direction is stacked in the axial direction becomes, a shall such are fastened by the fastening member each core sheet is inserted into the fastening holes that are stacked,
The embedded magnet is characterized in that the center position when viewed from the axial direction is set at a position of 27% or more and 52% or less from the radially inner side in a radial range in which the magnet is disposed. Type rotating electric machine. The embedded magnet type rotating electric machine according to claim 7 ,
The fastening hole has a center position as viewed from the axial direction set at a position of 36% or more and 41% or less from a radially inner side in a radial range in which the magnet is disposed. Type rotating electric machine.

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